diff --git a/src/mdrv2.cpp b/src/mdrv2.cpp
index cd24f1e..00fbdcc 100644
--- a/src/mdrv2.cpp
+++ b/src/mdrv2.cpp
@@ -66,7 +66,7 @@
 bool MDR_V2::smbiosIsAvailForUpdate(uint8_t index)
 {
     bool ret = false;
-    if (index > maxDirEntries)
+    if (index >= maxDirEntries)
     {
         return ret;
     }